Question

Sin 4A= Cos (A-20)
4A is an acute angle

find value of A​

Answer 1

Answer:

HERE IS UR ANS:-

sinx = cos(90 - x)

==> 4A = 90° - A + 20°

5A = 110°

==> A = 22°

Also, 4A = 88° is acute.

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Answer 2

Answer:

Answer is 22 degree